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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a363a84d2aeb5324136c3f334537e0d2b1218c08427a7d8fea12062b87d9275' 
  AND token = '9RaOzyFUn69kRBfpU1fOm96ZbZ6pOp3rmqIZR1tZVdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}